Amazon.com: 20 Feet NEMA L14-30P/L14-30R Generator Extension Cords, 4 Prong Heavy Duty, 30 Amp,125/250V,Up to 7500W 10AWG Cable and The Cable UL Certification,Black : Patio, Lawn & Garden
25 ft. 30A 125V Flat Generator Extension Cord - Champion Power Equipment
Amazon.com: RVMATE 30 Amp Generator Cord 4 Prong 100 Feet, NEMA L14-30P/L14-30R, 125/250V Up to 7500W 10 Gauge SJTW Generator Extension Cord, ETL Listed : Patio, Lawn & Garden
Champion Power Equipment Champion 25-Foot 30-Amp 125/250-Volt Duplex-Style Flat Generator Extension Cord (L14-30P to Four 5-20R) - Yellow in the Generator Accessories department at Lowes.com